a(n) = floor(90/n).

Terms

a(0) =90a(1) =45a(2) =30a(3) =22a(4) =18a(5) =15a(6) =12a(7) =11a(8) =10a(9) =9a(10) =8a(11) =7a(12) =6a(13) =6a(14) =6a(15) =5a(16) =5a(17) =5a(18) =4a(19) =4a(20) =4a(21) =4a(22) =3a(23) =3a(24) =3a(25) =3a(26) =3a(27) =3a(28) =3a(29) =3